
  div {
    margin: 10px;
  }
  
  input {
    padding: 10px;
    border: 1px solid orange;
    background: #fff;
    border-radius: 5px;
  }
  
  input[type="submit"] {
    background: orange;
    color: #fff;
  }
  
  input[type="submit"] disabled  {
    background: #eee;
    border-color: #eee;
    color: #ccc;
  }
  form {
    border: 1px solid #ccc;
    padding: 20px;
    width: 300px;
    margin: 30px auto;
  }
  .wrapper {
    margin-bottom: 10px;
  }
  .box {
    display: inline-block;
    width: 30px;
    height: 30px;
    margin-right: 10px;
    position: relative;
    background: orange;
    vertical-align: middle;
    border-radius: 100%;
  }
  .box input {
    opacity: 0;
    position: absolute;
    top:0;
    left:0;
    width: 100%;
    height:100%;
    z-index:100;/*使input按钮在span的上一层，不加点击区域会出现不灵敏*/
  }
  
  .box span { 
    display: block;
    width: 10px;
    height: 10px;
    border-radius: 100%;
    position: absolute;
    background: #fff;
    top: 50%;
    left:50%;
    margin: -5px 0  0 -5px;
    z-index:1;
  }
  
  input[type="radio"] + span {
    opacity: 0;
  
  }
  input[type="radio"]:checked + span {
    opacity: 1;
  }
  ::selection{
    background: red;
    color: white;
  }
  ::-moz-selection{
    background: red;
    color: white;
  }